Performs a nop operation against the given server.
Allows to make a nop request to a remote server. This nop (no operation) is just a nully request sent to remote peer and replied back to check if we have connection to remote peer.
This function works pretty much like ping.
|server ||The server to check. |
|usr_function ||A user function to execute when replies arrives. |
|usr_data ||A user data to pass in to usr_function.|
- TRUE if request was sent or FALSE if not.